Wolf Blitzer delivers the most important breaking news and political, international, and national security stories of the day. Tune to The Situation Room weekdays 5-6:30pm ET on CNN.
Watch Lisa Sylvester's report in the 6pm ET hour of The Situation Room for more on this story.
(CNN) - The FBI said Monday it believes it knows who was behind one of the most significant art heists in the United States - the 1990 theft of 13 precious works, once valued at $500 million, from Boston's Isabella Stewart Gardner Museum.
A couple of catches in the announcement: The FBI didn't reveal the suspects' names, and the artwork still hasn't been recovered. But the FBI said the suspects "are members of a criminal organization with a base in the mid-Atlantic states and New England."